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 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2020 QuestDB
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 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
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 *  http://www.apache.org/licenses/LICENSE-2.0
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 *  distributed under the License is distributed on an "AS IS" BASIS,
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package io.questdb;

import io.questdb.cairo.CairoEngine;
import io.questdb.griffin.FunctionFactoryCache;
import io.questdb.log.Log;
import io.questdb.mp.WorkerPool;
import io.questdb.mp.WorkerPoolConfiguration;
import org.jetbrains.annotations.Nullable;

import java.io.Closeable;

public interface WorkerPoolAwareConfiguration extends WorkerPoolConfiguration {
    WorkerPoolAwareConfiguration USE_SHARED_CONFIGURATION = new WorkerPoolAwareConfiguration() {
        @Override
        public int[] getWorkerAffinity() {
            throw new UnsupportedOperationException();
        }

        @Override
        public int getWorkerCount() {
            return 0;
        }

        @Override
        public boolean haltOnError() {
            throw new UnsupportedOperationException();
        }

        @Override
        public boolean isEnabled() {
            return true;
        }

    };

    static WorkerPool configureWorkerPool(
            WorkerPoolAwareConfiguration configuration,
            WorkerPool sharedPool
    ) {
        return configuration.getWorkerCount() > 0 ? new WorkerPool(configuration) : sharedPool;
    }

    @Nullable
    static  T create(
            C configuration,
            WorkerPool sharedWorkerPool,
            Log log,
            CairoEngine cairoEngine,
            ServerFactory factory,
            FunctionFactoryCache functionFactoryCache
    ) {
        final T server;
        if (configuration.isEnabled()) {

            final WorkerPool localPool = configureWorkerPool(configuration, sharedWorkerPool);
            final boolean local = localPool != sharedWorkerPool;
            final MessageBus bus = local ? new MessageBusImpl(cairoEngine.getConfiguration()) : cairoEngine.getMessageBus();

            server = factory.create(configuration, cairoEngine, localPool, local, bus, functionFactoryCache);

            if (local) {
                localPool.start(log);
            }

            return server;
        }
        return null;
    }

    boolean isEnabled();

    @FunctionalInterface
    interface ServerFactory {
        T create(C configuration, CairoEngine engine, WorkerPool workerPool, boolean local, @Nullable MessageBus messageBus, @Nullable FunctionFactoryCache functionFactoryCache);
    }
}